Mainframe architecture is a large, expensive, and isolated system. They main problem withmainframe architecture is that it cannot be scaled up very easy. Scaling refers to increasing thenumber of users and volume of operation.Client-server architecture is separated into the presentation, application, and data layers.Separating the application into distinct layers allows for easier scaling.Service-oriented architecture is the latest generation in the evolution. In this architecture,capabilities of the system are delivered via services that can be consumed by any application.This makes scaling and the development of new composite capabilities very easy
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